A son accused of killing his hedge-fund founder father over an argument about allowance learned Friday he had been indicted, although the charges haven't yet been made public. Tommy Gilbert, 30, appeared in court briefly in an orange jail jumpsuit and sneakers to hear whether he had been indicted in Sunday's shooting, which left biotechnology investor Thomas Gilbert Sr. dead on the floor of his apartment on Manhattan's tony Beekman Place and put a spotlight on his privileged son's problems.